Middle Ordovician cephalopods from the Abarsaj area, northern Iran

Four cephalopod taxa are described from the Abastu Formation at a locality near the village of Abarsaj, northern Iran. The described fauna includes Orthocerida indet, Eosomichelinoceras sp., Proterovaginoceras incognitum? and Sactorthoceras sp. suggesting a late Dapingian to Darriwilian (Middle Ordovician) age of the strata. The reported assemblage belongs to an open marine faunal association and its composition suggests a close affinity with those of Baltica and South China.